✨ add framework for subprocess

src/natives/subprocess.cpp

@@ -0,0 +1,14 @@
+#include "natives/subprocess.h"
+
+namespace nasal {
+
+var builtin_subprocess_run(context* ctx, gc* ngc) {
+    return nil;
+}
+
+nasal_builtin_table subprocess_native[] = {
+    {"__subprocess_run", builtin_subprocess_run},
+    {nullptr, nullptr}
+};
+
+}